Abstract
Concrete creep plays a significant role in the long‐term performance of the prestressed concrete structure. However, most of the existing prediction models cannot accurately reflect the in‐site concrete creep in a bridge construction environment. To improve the prediction accuracy of creep effects in concrete structures, an innovative creep analysis method is developed in this study. Parameters in the creep model in fib MC 2010 have been calibrated with respect to the long‐term loading test results of the prestressed concrete beam. The measured strains of concrete and the midspan deflections of the test beam are compared with the predicted results using the creep model in fib MC 2010. It indicates that the results predicted by the calibrated creep model are in good agreement with the test results. However, the results predicted by the creep model in fib MC 2010 significantly deviate from the test results. This proposed creep analysis method can provide a new thought to improve the predicted effect of the creep effects on creep‐sensitive structures.
Highlights
Concrete creep plays a significant role in the long-term performance of concrete structures [1,2,3,4,5]
Yang et al [26] carried out the experimental analysis of 32 m precast PC box girder and compared it with the theoretical results calculated by JTG 2004, fib MC 2010, and GL2000. ese comparisons show the significant differences between the predictions supplied by these models especially for delayed deflections at very long times
For large-span prestressed concrete bridges, which are sensitive to concrete creep, it is necessary to establish a creep analysis method suitable for site conditions. erefore, an innovative creep σ σc σc σc (t)
Summary
Concrete creep plays a significant role in the long-term performance of concrete structures [1,2,3,4,5]. E long-term deflections predicted by the creep models in different design codes have a great difference [19,20,21]. Granata et al [23] investigated the effects of time-dependent phenomena on prestressed concrete girder bridges and made a compared analysis on the creep behaviors for actual cases of bridges by using the creep prediction models in Eurocode 2, ACI 209, B3, GL2000, and AASHTO 2007. Long-term creep tests of six T-section beams with different prestressing levels under nonstandard environmental condition are carried out to simulate the insite concrete creep in the bridge construction environment. E objective of this study is to determine the parameters of the creep model with respect to the concrete creep test for a specific engineering project and propose the concrete creep model that meets the actual in-site environmental conditions. It should be noted that the creep model provided here can only be used to calculate the creep of concrete structures under the conditions in this study. e proposed creep analysis method can provide experience for the analysis of structural creep effect
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